First-term Democratic Senator Kamala Harris of California, a rising party star and outspoken critic of President Donald Trump's immigration policies, launched her 2020 campaign for the White House on Monday by touting her background as a prosecutor.

The U.S. Transportation Security Administration, where employees are going unpaid amid a partial government shutdown, said on Monday that unscheduled absences among U.S. airport security officers rose to a record 10 percent on Sunday as the shutdown reached its 31st day.

Winter winds brought extreme cold and ice-slicked roads to the Midwestern and Eastern United States on Monday, with the U.S. Martin Luther King Jr. Day holiday and an ongoing government shutdown allowing many to heed official advice to stay indoors.